Database query

Hello,
I have a query, that I am trying to have a conditional statement for a variable that I will pass into the query. If I use one of the conditions it works, but if I try both I can't get it to work. I would appreciate any help.

Hello,
I have a query, that I am trying to have a conditional statement for a variable that I will pass into the query. If I use one of the conditions it works, but if I try both I can't get it to work. I would appreciate any help.